Actually if factor is equal to total number of nodes with SimpleStrategy one
copy will be placed on each node.Does LOCAL_ONE know to choose local (the same)
node with SimpleStrategy?
On Sunday, April 2, 2017 4:02 PM, Sam Tunnicliffe <s...@beobal.com> wrote:
auth logins for super users is 101 replicas serving the read
This only applies to the default superuser (i.e. 'cassandra'), which is one of
the reasons for recommending it is only used during initial setup[1]. Reads for
all other users, including superusers, are done at LOCAL_ONE
[1]
http://cassandra.apache.org/doc/latest/operating/security.html#authentication
On Sun, Apr 2, 2017 at 7:07 AM, Jeff Jirsa <jji...@apache.org> wrote:
> You should use a network topology strategy with high RF in each DC
There's some debate here - some blogs/speakers will say to put a replica on
each instance, but that falls down above a few dozen instances. Imagine if you
have (for example) 200 instances per DC, auth logins for super users is 101
replicas serving the read - that's a really slow login that's likely to fail
(think about thread pools on the coordinator doing the read response handling,
it's an ugly ugly mess).
Normal logins do use LOCAL_ONE though so if there are lots of replicas, auth
will be faster - so use 5-10 replicas per DC, and crank up the caching timeouts
as well
